[問題]PP-T1-DS-147

[amyliang]

147. 14800-!-item-!-187;#058&010134
Each employee on a certain task force is either a manager or a director. What percent of the employees on the task force are directors?

(1) The average (arithmetic mean) salary of the managers on the task force is $5,000 less than the average salary of all employees on the task force.
(2) The average (arithmetic mean) salary of the directors on the task force is $15,000 greater than the average salary of all employees on the task force
Ans:C

(我選E，不知道為什麼C可以求出來有多少個D，我的列式是Total salary for Manager is X, and total salary for Direct is Y. M個maranger D個director 所以要問D/(M+D)
(1)X/M=(X+Y)/(M+D)-50000 (四個位知數無法求出)
(2)Y/D-15000=(X+Y)/(M+D) (四個位知數無法求出)

[nemolee]

http://www.formosamba.com/phpBB3/viewtopi ... rtain+task